"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW3G-LW4 : 14 August 2017), Mary Peterson in entry for Thos Peterson, 1880; citing enumeration district ED 272, sheet 21B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 0611; FHL microfilm 1,254,611.
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